Three spheres A, B, and C are placed in a line from left to right. Sphere B (-2.0 µC) is 30 cm to the right of sphere A (-3.0 µC ) and sphere C (-5.0 µC ) is 50 cm to the right of sphere B. What is the net force acting on sphere A? N Select an answer A 30 cm 50 cm

The figure shows a hydrogen atom, with an electron orbiting a proton. a. What force or forces act on the electron? b. On the figure, draw the electron's velocity, acceleration and the force vectors

A student (with a "rubbed" nail in her hand) sees another nail floating in a pan of water and decides to test to see whether is "rubbed" also. She holds the tip of the "rubbed" nail to the tip of the floating nail (as shown in the diagram) and sees that there is an attraction between them. What can she conclude from just this observation? D The floating nail has definitely not been rubbed O The floating nail has definitely been "rubbed" O It is not possible to say whether the floating nail has been rubbed or not. Question 2

B1

Part A An electron is moving east in a uniform electric field of 1.55 N/C directed to the west. At point A, the velocity of the electron is 4.52x105 m/s pointed toward the east. What is the speed of the electron when it reaches point B, which is a distance of 0.365 m east of point A? Express your answer in meters per second. ? Ve = m/s Part B A proton is moving in the uniform electric field of part A. At point A, the velocity of the proton is 1.88x1o4 m/s , again pointed towards the east. What is the speed of the proton at point B? Express your answer in meters per second. Up = m/s

A Which would best describe the force on an electron placed at point A? (a) (b) (c) (d) ABCD 0000

Problem 20.03 A proton traveling at 4.40 km/s suddenly enters a uniform magnetic field of 0.750 T, traveling at an angle of 55.0° with the field lines (see (Figure 1)). Figure 55.0⁰ Ł Proton B < 1 of 1 ▾ Part B Find the magnitude of the force this magnetic field exerts on the proton. Express your answer in newtons to three significant figures. ΑΣΦ F= Submit ▾ Part C Fmax = Submit V Part D 4 Request Answer If you can vary the direction of the proton's velocity, find the magnitude of the maximum force you could achieve. Express your answer in newtons to three significant figures. [V] ΑΣΦ ^ ? Request Answer 13 ? N ⒸE ? If you can vary the direction of the proton's velocity, find the magnitude of the minimum force you could achieve. Express your answer in newtons to three significant figures. VG] ΑΣΦ | € P Pearson N

What physical phenomenon predominantly contributes to the magentic field of the earth?   a. Charged particles from the solar wind that enter the earth's atmosphere   b. The ionization of metals in the earth's crust   c. Ionization in the earth's atmosphere   d.  Ion convection in the molten liquid shell that surrounds the earth's solid inner core   e. The total amount of ferromagnetic iron, cobalt, and nickel that is present in the earth's crust

A simple and common technique for accelerating electrons is shown in the figure, which depicts a uniform electric field between two plates. Electrons are released, usually from a hot filament, near the negative plate, and there is a small hole in the positive plate that allows the electrons to pass through.   Randomized Variables E = 2.7 × 104 N/C Calculate the horizontal component of the electron's acceleration if the field strength is 2.7 × 104 N/C. Express your answer in meters per second squared, and assume the electric field is pointing in the negative x-direction as shown in the figure.

D=7